We recommend humidifiers with an overall score of at least 80%.

This overall score is made up of humidity performance (40%), water output (30%), energy efficiency (20%) and ease of use (10%).

This score is based on how well each humidifier dispersed the moisture.

This score is based on the measured water capacity per hour.

This score is based on the running cost and water dispersion rate in our performance testing, using an electricity cost of 30c/kWh.

This scores is based on how easy it is to clean and fill the tank as well as the ease of interpreting the included instructions.

The measured power consumption, in watts, on the unit's highest power setting.

How noisy the humidifier is on its highest setting, measured in A-weighted decibels.

Output of moisture, measured in millilitres per hour.

Water consumption, measured in litres per hour.

With some of the humidifiers we tested, water was observed on the floor after the humidistat test.

'Tested models' are those that we've tested that are currently available in shops. 'Discontinued models' are ones we've previously tested that you might be able to find in second-hand stores.

Recommended or typical retail price.

The cost of operating the humidifier for 8 hours over a 24-hour period, based on an electricity cost of 30c/kWh.

The cost of operating the humidifier for 8 hours a day over a 90-day period, based on an electricity cost of 30c/kWh.

Energy use, measured in kilowatt-hours per litre.

Claimed area of operation for moisture dispersal.

The claimed power consumption, measured in watts.

The ability to deliver both a warm and cool mist can be handy depending on the season.

Some humidifier models include a timer.

Smart app support offers features such as humidity measurements and operational timing.

Some models have a see-through tank that can be illuminated as a night light.

Whether the humidifier has a cleaning brush included in the kit.

A filter can help remove particles from the air.